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2,167 Articles
6,837 Members
120 Directory Listings
140,558 Followers

The world's best gem articles, published weekly.

Most Recent Articles

How Well Do You Know Your Birthstone Gemology?

How well do you know your birthstone gemology? Take our short quiz and learn about the composition, cutting, and value of birthstones.

Fluorite Value, Price, and Jewelry Information

Although too fragile for most jewelry use, fluorites are often faceted for collectors. They occur in a wide range of attractive colors and can be extremely bright. These gems are also renowned for their fluorescence.

Bead and Necklace Size Charts

Whether you’re a novice bead jewelry maker or just shopping for necklaces, these bead and necklace size charts and links to related articles can help you.

What is a Princess Cut Diamond?

What constitutes a princess cut? Jeff Graham examines a variety of diamonds sold as examples of this design and identifies their overall characteristics.

Fancy Colored Yellow Diamond Buying Guide

Fancy colored yellow diamonds are becoming increasingly popular. Our yellow diamond buying guide has the information you need before your next purchase.

Precious Coral Buying Guide

Deep-water coral displays bright, rich reds and delicate pinks. Our precious coral buying guide will help you choose a gem for your next jewelry piece.

Become a Gemology Pro

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"Becoming a Pro Member of IGS just made good sense for my business. The gemology resources are fantastic, and my profile lets potential customers know I am serious about colored gemstones. And frankly, if I get any exposure to potential customers it's a no-brainer."
Paul Bierker, Paul Michael Designs
Jeweler, IGS Pro Member

The world's best online resource for gemstone appraisal

Over 15 years, we have assembled detailed pricing and value information for appraising over 70 different gemstones. The values in our guide come from a variety of sources including primary and secondary gemstone dealers, jewelers, miners, and wholesale suppliers of commonly traded gemstones.

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